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Note 10 - Product Warranty Obligations - Reconciliation of Product Warranty Liability (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Balance at beginning of period $ 49,316 $ 41,785
Product warranty reserve assumed in acquisition 0 212
Payments (7,588) (5,634)
Provision for warranty issued 8,286 6,960
Changes in estimates for pre-existing warranties (991) 239
Balance at end of period 49,023 43,562
Balance at beginning of period 78,738 68,340
Deferred revenue contracts issued 5,939 5,800
Amortization of deferred revenue contracts (3,797) (3,296)
Balance at end of period $ 80,880 $ 70,844